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I am looking at throwing a set of heads, and cam on my car, and want to see what everyone thinks

I am getting a set of used gt40p's , and a custom cam. I already have a cobra intake, and all the other bolt ons.

Question 1: the cam is .510 / .510 210 / 216 114 LSA. I already have 1.7 rockers, and would like to continue using them. Are they gonna affect the effectivness of the cam, and do you think I am gonna have problems with pcv.

Question 2: If I wont have any problems with pvc, how much could I mill the heads, to get more compression. I dont mind cutting the pistons, so how much could I mill, and still use this cam, and 1.7's It will make it 541 lift.
 

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edit: you'll have to measure. I'm guessing you can mill 0.03 with that limited exhaust duration safely but you never know...
 
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